CDB4272
4
1. SYSTEM OVERVIEW
The CDB4272 demonstration board is an excellent means for evaluating the CS4272 stereo
CODEC. Analog and digital audio signal interfaces are provided, as well as a DB-25 computer
parallel port interface for use with the supplied Window
®
configuration software.
The CDB4272 schematic set has been partitioned into 10 pages and is shown in Figures 6
through 15.
1.1
CS4272 Stereo Audio CODEC
A complete description of the CS4272 is included in the CS4272 product data sheet.
1.2
CS8406 Digital Audio Transmitter
The operation of the CS8406 transmitter (see Figure 11) and a discussion of the digital audio
interface are included in the CS8406 data sheet.
The CS8406 converts the PCM data generated by the CS4272 to the standard S/PDIF data
stream. The CDB4272 is able to operate the CS8406 in either master or slave mode. The
serial audio input data for the CS8406 is received from the serial audio output of the CS4272.
Using the GUI, the user may elect to supply the CS8406 with an external serial audio data
source through a stake header (J17). Digital Interface format selection of either Left Justified
or I
2
S can be made via the control port GUI or via the I2S/LJ position on switch, S1
(see Table 2 for switch control options).
1.3
CS8416 Digital Audio Receiver
The operation of the CS8416 receiver (see Figure 10) and a discussion of the digital audio
interface are included in the CS8416 data sheet.
The CS8416 converts the input S/PDIF data stream into PCM data for the CS4272. The
CDB4272
is able to operate the CS8416 in master or slave mode. Digital Interface format se-
lection of either Left Justified or I
2
S can be made via the I2S/LJ position on S1. Left Justified,
I
2
S or Right Justified interface formats can be selected via the control port GUI.
The CS8416 always sources an MCLK signal. As a result, it should be noted that the CS8416
will provide invalid data in modes where the MCLK signal is generated by the CS4272 or re-
ceived through the stake header (J26). Care should be taken to ensure that the crystal (Y2)
is removed when the board is configured to receive MCLK from the CS8416.
The CS8416 contains an internal input multiplexer which must be set to receive the appropri-
ate stream from the Optical or Coaxial input connector. This may be done via the
Coaxial/Optical position on S1, or through the control port GUI.
Содержание CDB4272
Страница 16: ...CDB4272 16 5 SCHEMATICS AND LAYOUT Figure 6 Hierarchy Schematic Sheet 1 ...
Страница 17: ...CDB4272 17 Figure 7 CS4272 Schematic Sheet 2 ...
Страница 18: ...CDB4272 18 Figure 8 Analog Input Schematic Sheet 3 ...
Страница 19: ...CDB4272 19 Figure 9 Analog Output Schematic Sheet 4 ...
Страница 20: ...CDB4272 20 Figure 10 CS8416 S PDIF Receiver Schematic Sheet 5 ...
Страница 21: ...CDB4272 21 Figure 11 CS8406 S PDIF Transmitter Schematic Sheet 6 ...
Страница 22: ...CDB4272 22 Figure 12 Board Setup Schematic Sheet 7 ...
Страница 23: ...CDB4272 23 Figure 13 PCM Header Schematic Sheet 8 ...
Страница 24: ...CDB4272 24 Figure 14 Control Port Schematic Sheet 9 ...
Страница 25: ...CDB4272 25 Figure 15 Power Schematic Sheet 10 ...
Страница 26: ...CDB4272 26 Figure 16 Component Placement and Reference Designators ...
Страница 27: ...CDB4272 27 Figure 17 Top Layer ...
Страница 28: ...CDB4272 28 Figure 18 Bottom Layer ...
Страница 29: ...CDB4272 29 6 APPENDIX Complete Analog Input Buffer Schematic Figure 19 Complete Analog Input Buffer Schematic ...
